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| All Patents in class 74/97.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,085,300 | Jun. 29, 1937 | E.J. Dillman | Control Device | flow controls | |
| 2,267,688 | Dec. 23, 1941 | W.S. Landon | Control Device | flow controls | |